How do I convert multiple full sized DNGs to lossy DNGs within Lightroom?

Hi,
When I select multiple DNGs from within Lightroom, and on my mac go to menu>Library>Convert photo to DNG and then choose to convert to DNG with the lossy mode selected, only one of the selected DNGs is converted. How do I convert more at the same time? I have a large library, and I want to convert ~100gb of photos to lossy.
Thanks in Advance!

As far as my own collection goes, I would say I love about 1-2% of my pictures. I would like to use the top 5% for making printed family albums, and I use Lightroom to develop these images. The next 5-10% I would partially process and keep somewhere online at lower resolution, like on flickr. The next 20-40% I would like to keep around in storage, and the rest I trash.
These last 20-40% that I want to keep would be fine as lossy DNGs. I would treat them as JPEGs that have a bit more dynamic range for the future, but as I shoot with a 24mp Nex-7, they are huge, and won't ever be pixel-peeped. I have examined the difference between my 25mb DNGs and the converted 7mb lossy DNGs, and for my uses, they are functionally identical.
The issue is that I need to import them into Lightroom before I rate them. Once I rate my images, I flag the ones I want to work on further, and delete the worst. I would like a way to convert the remaining ones more easily. Of course if I knew which ones were 2nd-rate keepers from the outset, I would import them as lossy DNGs to start with.
I often have 3-4000 images to process after a holiday, so I need a fast method of compressing these DNGs.

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How do I convert multiple full sized DNGs to lossy DNGs within Lightroom?

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